In the underground city of a cyberpunk wasteland, Xiao Tian transmigrates into the body of a disabled, pure-white puppy and activates the Devouring Evolution System. Under the protection of Zhong Yue, a kind older sister, he rises from the bottom by hunting modified beasts and awakens the White Wolf Cybernetic Armament. Facing relentless pressure and encirclement by the Wild Boar Gang, the Iron Tiger Gang, and the Golden Bear Group, Xiao Tian acts decisively, leading his sisters across the Desert of Death and the Frozen Wasteland as he breaks through to extraordinary realms. He then explores ancient ruins and accepts his destined mission to overthrow Alice, the tyrannical superintelligent AI. Finally, on the night of the full moon, Xiao Tian turns the tables and devours Alice's core, ascends to the pinnacle of the Demon Saint realm, kills Lei Zhentian, is crowned King of the Underground City, and establishes a new peaceful order.